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Commit 0eca6b7c authored by Yanmin Zhang's avatar Yanmin Zhang Committed by Linus Torvalds
Browse files

printk: add module parameter ignore_loglevel to control ignore_loglevel 



We are enabling some power features on medfield.  To test suspend-2-RAM
conveniently, we need turn on/off ignore_loglevel frequently without
rebooting.

Add a module parameter, so users can change it by:
/sys/module/printk/parameters/ignore_loglevel

Signed-off-by: default avatarYanmin Zhang <yanmin.zhang@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 73efc039

Documentation/kernel-parameters.txt

+3 −0
Original line number Diff line number Diff line
@@ -973,6 +973,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
	ignore_loglevel	[KNL]

			Ignore loglevel setting - this will print /all/

			kernel messages to the console. Useful for debugging.

			We also add it as printk module parameter, so users

			could change it dynamically, usually by

			/sys/module/printk/parameters/ignore_loglevel.



	ihash_entries=	[KNL]

			Set number of hash buckets for inode cache.

kernel/printk.c

+3 −0
Original line number Diff line number Diff line
@@ -532,6 +532,9 @@ static int __init ignore_loglevel_setup(char *str) 
}



early_param("ignore_loglevel", ignore_loglevel_setup);

module_param_named(ignore_loglevel, ignore_loglevel, bool, S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to"

	"print all kernel messages to the console.");



/*

 * Write out chars from start to end - 1 inclusive